This is because Atzilut itself is not complete except with its garments. What this means is that since it is proper that man should be clothed in his garments, if so, when we speak about the supreme Likeness of Man, we understand this as being clothed in garments. Accordingly, when we speak of Atzilut, we must undertand that it has three garments – i.e. Beriyah, Yetzirah and Asiyah in the category of garments, as discussed further below. Atzilut is unable to carry out even what specifically relates to it except if it is clothed in Beriyah, Yetzirah and Asiyah as garments, which become the “wings” of the Shechinah, as stated in the Zohar.